2g maf blow through?

[jayrogers]

I have read that if you install a 2g maf in a 1g car it will make the mix 20% leiner. I also read you can fix this with 550cc injectors because they richen the mixture 20%. Is this safe, true. My real question is can a 2g maf be installed in a 1g in a blow through system. Is this possible? If so would it be compatible with my current setup.

 

[TurkF26]

What is your reasoning for wanting a blow through setup??? To just vent BOV or for future upgrades?? If you really want a blow through setup, just get a GM maf and translator. If you dont want to deal with all that, just replace your 1g maf with a 2g maf and rewire it in there.

 

[brute]

And the answer is no. You cannot use either 1g or 2g MAFs as a blow through setup.

 

[jayrogers]

sounds good was planning to take that rought but just had the question pop in my head so i thought i would ask.

 

[JayRolla]

Is the only reason you want to go blow through is just to vent the BOV?

 

[Quasimondo]

That's the only reason anybody would want to run an air sensor in blow-thru

 

[TurkF26]

That's the only reason anybody would want to run an air sensor in blow-thru

???? Um no theres actually a + to running a GM Maf blow-through setup. Granted most of the people on here dont out-flow the stock 2g maf but it is possible and i have seen it happen. You are right that most people do the blow-through setup just to vent their BOV but if you have the right tuning devices, and know what you are doing, a GM Maf can do really well.

 

[steve]

Um, no theres actually a + to running a GM Maf blow-through setup.

Ok don't leave us all hanging, what is it?

Steve

 

[JayRolla]

Yea whats the +. Just that it flows a little better. Im all about tuning with an air temp sensor.

 

[steve]

It's doesn't flow any better in blow through than it does in draw through so what's the advantage.

Steve

 

[TurkF26]

Its the fact that you can outflow the 2g Maf. Yes some people perfer to tune with an air temp sensor but for myself, a gm maf with dsmlink is great. Also moving the maf closer to the intake manifold theroretically will give you a more accurate air flow reading. Logically, if you have the Maf in the stock location, it meters the air as it goes into the turbo, then compressed, going into the intercooler then through the piping. In that transit, you can/may lose a little air but even then its probably not enough to mae that much of a difference. Also with running a GT35R and using a tial bov, you gotta move it between the bov and the throttle body. I guess it comes down to application/personal preference on what you want to do.

 

[TurkF26]

Steve, like i said its more of an opinion on the blow-through setup but with a setup of using a tial bov, big turbo, etc.. moving the GM maf up between the bov and the intake manifold is what you have to do.

 

[wret]

One distinct advantage to the blow-through setup is that with a blown coupler, anywhere before the MAF, you can still maintain highway speeds and the "limp" home does not elicit many evil stares and honks from the backed up traffic behind you.

 

[TurkF26]

One distinct advantage to the blow-through setup is that with a blown coupler, anywhere before the MAF, you can still maintain highway speeds and the "limp" home does not elicit many evil stares and honks from the backed up traffic behind you.

good point there never really thought of that. There may not be a better advantage to a blow through setup but i personally feel that having the Maf closer to the throttle body is better than having it meter the air as it goes into the turbo.

 

[steve]

Wret provides us with the answer I was expecting. The only advantage is the same one that lets one vent the BOV or "theroretically will give you a more accurate air flow reading". The closer the metering is to the intake valves the less there is that can break and effect the metering. Limping home would seem like a valid point.

Steve

 

[TurkF26]

Well you said it yourself, they are both valid points. Wret has a very valid point and so is the point that the closer the maf is to the intake valves the closer the metering will be. I guess all in all its an upgrade left to those who feel it is necessary. I fell sorry for the people that buy the maf, and the translator to just vent their bov's because in that effect, its a waste of money and time but if you are outflowing the 2g maf, a gm maf in either the stock location or blow through setup works great. I really had no choice since i went with a tial bov but its not like you lose anything by running a blow through setup.

 

[JOEY A]

Ive always heard that it helps with spool a little bit, I dont know if thats true or not since ive never used it.

Ive heard now dont qoute me on this, but somtimes moisture will get into the maft box and the car can run shitty..........Im geussing it was mounted in a bad area.

 

[JOEY A]

Dont hold me to that, but thats just what ive heard along the grape vin

 

[steve]

so is the point that the closer the maf is to the intake valves the closer the metering will be.

GM MAFs however do have problem with metering depending on where you place them and how they are oriented. Ignoring that, there should be no difference as long as you don't have leaks in your intake. In practical use as long as you calibrate your MAF how/where they are installed makes little difference.

Steve

 

[olmytsi]

I went to a friend's shop a few days ago and they had just installed 2 RIPP mods supercharger kits on a 3g v6 and a lancer ralliart. And they are both running the stock mafs in blow through. Aren't those mafs the same design as ours?

 

[nightspeed87]

i was thinking of going with a gm maft instead of 2g because my friend has a gm maft he said he'll give me... Is it harder to hook up than a 2g maft? ( never hooked up either ) and do i need safc and/ or larger injectors before i hook up the gm maft ( like needed with 2g maft ) ? I dont plan on doing it anytime soon but just for further knowledge..
( and by the way i would like to vent my bov, i have a turbo xs right now that im not using so im about to sell it but i want the hks sequential one, i like how those sound )

 

[steve]

i was thinking of going with a gm maft instead of 2g because my friend has a gm maft he said he'll give me.

Does your friend have both the GM MAF and the Translator or just the MAF?
You need the MAF Translator (MAFT) to run a GM hotwire MAF.

Steve

 

[Quasimondo]

Its the fact that you can outflow the 2g Maf. Yes some people perfer to tune with an air temp sensor but for myself, a gm maf with dsmlink is great. Also moving the maf closer to the intake manifold theroretically will give you a more accurate air flow reading. Logically, if you have the Maf in the stock location, it meters the air as it goes into the turbo, then compressed, going into the intercooler then through the piping. In that transit, you can/may lose a little air but even then its probably not enough to mae that much of a difference. Also with running a GT35R and using a tial bov, you gotta move it between the bov and the throttle body. I guess it comes down to application/personal preference on what you want to do.

If you can outflow a 2G mas, then you're at the point where you need to convert to a speed density setup and do away with a mas completely. Moving the air sensor closer to the intake will give you no more of an accurate reading than if you were to have it right at the inlet of the turbo. If you have anything that will show me otherwise, I'll retract my statement.

Because of the way a hotwire maf operates (it measures how much voltage is needed to maintain a wire filament at a constant temperature, using that measurement to calculate how much air is flowing through at the time) temperature changes will affect how that maf calculates airflow. This is important when you're dealing with such things as a heatsoaked intercooler which blows hot air across this filament, reducing the amount of voltage needed to keep that wire at its constant temperature, resulting in a lower calculated airflow number. Is it enough to make your car run dangerously lean? No, but it is enough to give you an inconsistent tune from run to run.

In tuning, you need to reduce as many uncontrollable variables to get consistent numbers. In this case, sticking a hotwire air sensor in an area that subjects it to a wide range of temperature changes will create as much of an uncontrollable variable as an overruning fuel pressure regulator, for example. There's nothing wrong with the GM maf, but there is no performance benefit to running it in blow-thru versus draw-thru.

 

[MyBeatGSX]

Just out of curiousity, WHY can't a 2G MAF be run in blow through? Then boost leaks are no longer a fuel issue, you can keep driving when your IC piping blows off, and it will read intake air temp POST intercooler which is more accurate to what the engine is actually seeing. If there is a slight difference in airflow readings, it should be fairly even across the board and easy to tune out.

Does the karman design just not work in blow through? More than anything else, I just want to be able to drive if piping blows off, getting stranded and replaced IC couplers on the side of the road with a hot engine isn't fun.

 

[wret]

Just out of curiousity, WHY can't a 2G MAF be run in blow through?

Because the Mitsubishi Karman-vortex type sensor is designed to operate within a range of pressures experienced in normal atmospheric conditions. Pressurized (boosted) air would be off it's scale. GM MAF sensors, utilizing the hot-wire principle, are capapable of registering the change in air density from pressurized air.